<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>引入css代码</title>
</head>
<body>
<!--
行内引入
-->
<div style="width: 200px;/*height: 200px;border:1px solid red*/">我是div</div>
<div>我是div</div>

</body>
</html>